Justin Ahinon

WordPress Media Assistant is a plugin that displays useful information about your media library as the number of images, 
the format, the upload date, etc…
Credits
<a href="https://segbedji.com/" title="Justin Sègbédji Ahinon" rel="nofollow ugc">Justin Sègbédji Ahinon</a>, WordPress Developer and Core Contributor. <a href="https://github.com/JustinyAhin" title="@JustinyAhin on Github" rel="nofollow ugc">Github</a>.
Add your own language pack on GlotPress or do pull requests on <a href="https://github.com/JustinyAhin/wp-media-assistant" title="Plugin repo on Github" rel="nofollow ugc">Github</a>. Contributors will be credited here 🙂

WP Media Assistant

Display useful informations about WordPress media library.

Marat Nepomnyashy

Setup image galleries in a jiffy via shortcodes specifying image slugs, and 
 have the images load in a jiffy by downloading only the minimum size image 
 necessary for the client viewport size. Images are rendered as large as 
 possible within the viewport when expanded.
No locked premium features, and tested to work on iOS devices.
Demo at: http://www.maratbn.com/projects/jiffy-gallery-press/#demo
Official project URLs:
https://wordpress.org/plugins/jiffy-gallery-press 
 https://github.com/maratbn/JiffyGalleryPress 
 http://www.maratbn.com/projects/jiffy-gallery-press

Jiffy Gallery Press

Setup image galleries in a jiffy via shortcodes.  No locked premium features.

WP Media Assistant vs Jiffy Gallery Press